laptop conf.d # emerge --resume
*** Resuming merge...
>>> Emerging (1 of 1) media-video/ffmpeg-0.4.9_p20061016 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking ffmpeg-0.4.9-p20061016.tar.bz2 ;-)
>>> Unpacking source...
>>> Unpacking ffmpeg-0.4.9-p20061016.tar.bz2 to /var/tmp/portage/ffmpeg-0.4.9_p20061016/work
 * Applying ffmpeg-libdir.patch ...                                                                      [ ok ]
 * Applying ffmpeg-shared-gcc4.1.patch ...                                                               [ ok ]
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/ffmpeg-0.4.9_p20061016/work/ffmpeg ...
true
ERROR: XviD not found
If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-devel@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.err" produced by configure as this will help
solving the problem.

!!! ERROR: media-video/ffmpeg-0.4.9_p20061016 failed.
Call stack:
  ebuild.sh, line 1539:   Called dyn_compile
  ebuild.sh, line 939:   Called src_compile
  ffmpeg-0.4.9_p20061016.ebuild, line 157:   Called die

!!! configure failed
!!! If you need support, post the topmost build error, and the call stack if relevant.